I just built up a new short block, broke it in well and ran one 30 lap race on the motor, it ran well. This past weekend it was running well for about 5-6 laps and then slowed down , (Sr. 206) would only turn 4900 rpm, I pulled in and check throttle linkage etc. went back out and it ran well for 2 laps then went back to slow and after another lap it started making a ticking noise internally, I pulled the valve cover and check the lash and all was good. Would a unconnected ez start clip cause this and if so will it require another short block?